Electrically-conductive sintered compact of silicon nitride mach

Details Electrically-conductive sintered compact of silicon nitride mach Electrically-conductive sintered compact of silicon nitride mach

1985-11-04

1987-04-21

Bell, Mark L.

Compositions

Electrically conductive or emissive compositions

Carbide containing

252520, 264 65, 501 87, 501 96, 501 97, 501 98, C04B 3558, C04B 3556

Patent

active

046595082

ABSTRACT:
An electrically-conductive sintered compact of silicon nitride which is machinable by electrical discharge machining and a process to produce the same. TiN and/or TiC powder is added to a powder of silicon nitride in an amount 15-40% by volume to act as a conductivity-supplying agent while 0.01-3.0% by volume MgO and/or Al.sub.2 O.sub.3 powder is added as a sintering assistant. The mixed powders are then preformed in a desired shape and sintered in a nonoxidizing environment at 1,600.degree. C.-2,000.degree. C. to obtain a compact of silicon-nitride machinable by electrical discharge machining due to its electrical conductivity being at least 1 S.multidot.cm.sup.-1.

REFERENCES:
patent: 3890250 (1975-06-01), Richerson
patent: 4528121 (1985-07-01), Matsushita et al.

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